Plumb-level.



UNrrnn srarns PATIENT CFFICIF.

PLUME-LEVEL Specification of Letters Patent.

Patented May '7, 1907.

Application filed October 26,1906. Serial No. 340,663.

To LZZ whom t may concern,.-

Be it known that I, CHRISTIAN LARsEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Im rovements in Plumb-Levels, of which the 'ollowe ing is a specification.

This invention is a tool or device particularly serviceable in connection with building operations and adapted to be used as a plumb level and also provided with means whereby angles may be sighted or taken.

The invention is illustrated in the accompanying drawings, in which Figure 1 is an elevation showing the device in position as a plumb. Fig. 2 is an elevation of the device in position as a level, and also showing an arm for taking angles. Fig. 3 is a cross section of the device. Fig. 4 is an enlarged detail, partly in section, of the sighting tube and parts adjacent to same.

Referring specifically to the drawings, 6 and 7 indicate parallel bars or pieces which may be made of any suitable material, such as wood, or light metal, such as aluminium. These side pieces are connected' and spaced apart by pieces 8, which are preferably made of metal in the form of a tube, and contain ordinary spirit levels the bubbles of which are exposed through openings in the tube formed for the purpose, as indicated at Sa. These openings are preferably on the sides ofthe tubes toward the ends of the main bars and exposed alternately toward opposite ends, so that when the device is used as a plumb, as shown in Fig. 1, the bubbles can be readily seen, and when reversed can be seen from either end. The side bars 6 and 7 are also connected at their ends by end pieces 9. At one end one of the bars has a pivot arm 18 connected by a set screw as at 14, and this arm will swing out to any angle desired., and may be fixed by the set screw. When swung in, it rests in a groove 15 formed in the side piece to receive it, and is flush with the edge of said piece so as to not interfere with the use of the latter as a plumb or level.

The grade level consists of a tube 10 which is conveniently formed in sections and has on the opposite ends a pair of spirit levels 11. The sights can be taken through the tube, one end being provided with a glass with crossed lines at the center and the other with a cap and eye hole. The tube is mounted on a pivot pin 9a which lits in a socket 9b formed in the side piece 7, and accordingly may be swung or turned to any angle desired. In Fig. 2 it is shown turned, and this function is of advantage in determining the level or angle of a foundation'or the like. Furthermore, the level 10 may be tilted, as in use in taking sights or angles on uneven ground.

This action is permitted by enlarging thel socket 9b on the inside so that the pivot 9 will swing therein to a certain extent, and the adjustment is effected bymeans of screws 18 which are set in recesses in the piece 7 and are operated by thumb nuts 18 exposed through the openings in the side of the piece 7. The inner endof the pivot pin 9a is held between the ends of the screws, and by ma nipulating the screws the pivot, and consequently the sightino device or level 10, may be tilted to various angles. The tube can be prevented from swinging by tightening the screws hard against the pivot.

The device is capable of all the uses of a plumb and level and also to determine angles and grades, to line up foundations and buildings, and the like.

I claim:

An instrument of the kind described, comprising a pair of bars having parallel straight edges, a pivoted sighting tube between the bars and arranged to swing in a plurality of planes at angles thereto, and a spirit level mounted on the tube.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses'.

CHRISTIAN LARSEN.

Witnesses:

NnLLrn FnL'rsKoG, II. G. BATCHELOR. 

